error[E0161]: cannot move a value of type `str`
  --> $DIR/issue-113279.rs:17:20
   |
LL |         } += match { *"" }.len() {
   |                    ^^^^^^^ the size of `str` cannot be statically determined

error[E0507]: cannot move out of a shared reference
  --> $DIR/issue-113279.rs:17:22
   |
LL |         } += match { *"" }.len() {
   |                      ^^^ move occurs because value has type `str`, which does not implement the `Copy` trait

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0161, E0507.
For more information about an error, try `rustc --explain E0161`.